Let's divide 86909835 by 509
We're looking to find how many times 509 goes into 86909835.

Going ahead to step 1:
509 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 509

On to step 2:
The number 509 fits into 86 0 times, leaving a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Append the next digit (9) from the dividend to 86 and continue with: 869 / 509

Moving on to step 3:
The number 509 fits into 869 1 times, leaving a remainder of 360.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 509 from 869, we get 360.
Append the next digit (0) from the dividend to 360 and continue with: 3600 / 509

Let's proceed to step 4:
The number 509 fits into 3600 7 times, leaving a remainder of 37.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Deduct 3563 from 3600 and we're left with 37.
Append the next digit (9) from the dividend to 37 and continue with: 379 / 509

Moving on to step 5:
509 goes into 379 0 times with a remainder of 379.
Use 0 as the next digit of our solution. 
Result so far: 170.0
Subtracting 0 from 379 leaves us with 379.
Include the next digit (8) from the dividend after 379, then repeat: 3798 / 509

Let's proceed to step 6:
509 can be fit into 3798 7 times, resulting in a remainder of 235.
Use 7 as the next digit of our solution. 
Result so far: 1707.0
Subtracting 3563 from 3798 leaves us with 235.
Take the next digit (3) from the dividend and append it to 235, then repeat: 2353 / 509

Step 7:
If we divide 2353 by 509, we get 4 and a remainder of 317.
Use 4 as the next digit of our solution. 
Result so far: 17074.0
If we subtract 2036 from 2353, we get 317.
Append the next digit (5) from the dividend to 317 and continue with: 3175 / 509

Advancing to step 8:
When dividing 3175 by 509, we get 6 with a remainder of 121.
Record the quotient 6 as the next digit in the result. 
Result so far: 170746.0
Subtract 3054 from 3175 to get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Advancing to step 9:
509 can be fit into 1210 2 times, resulting in a remainder of 192.
Use 2 as the next digit of our solution. 
Result so far: 170746.2
Subtract 1018 from 1210 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Going ahead to step 10:
1920 divided by 509 is 3 with a remainder of 393.
The next digit of our result is 3. 
Result so far: 170746.23
Subtract 1527 from 1920 to get 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Advancing to step 11:
When dividing 3930 by 509, we get 7 with a remainder of 367.
Use 7 as the next digit of our solution. 
Result so far: 170746.237
Deduct 3563 from 3930 and we're left with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Step 12:
The number 509 fits into 3670 7 times, leaving a remainder of 107.
The next digit of our result is 7. 
Result so far: 170746.2377
If we take 3563 away from 3670, we end up with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

The final result is 170746.2377 with a remainder of 0.00107.